Thank you very much Alison for taking the time on this. I really appreciate it.
Your suggestions are really helpful. I will have a mull over. I may delay the revelation about Helen disappearing to make it pack more of a punch. Once the reader is more unsettled about the school maybe. I like the idea of Eleanor being a replacement for Helen's position. The rest of the story does complicate that if I did it at a school level but there is maybe a smaller version of this i.e. she is put in her science lab team or something. And that might be a better way of her finding out that Helen has disappeared and would add a lot more tension in relation to Eleanor. I also love the idea of the clock having more of a presence too. It used to have a bit more of a looming description but I cut it so I will review and see if I can ramp that up a bit.
I am glad you enjoyed the style - that is good to hear. Thank you again for your ideas!